Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4DLZ callsign genealogy
Currently held by THRASH, FRANK W
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by W4DLZ's current licensee, walking backwards.
- THRASH, FRANK WFLgranted 2014-01-07cancelled 2014-06-03
Successor callsigns
Callsigns held now by people who previously held W4DLZ.
- THRASH, FRANK WFLgranted 2014-01-07cancelled 2014-06-03
All historical holders
Every license row we've seen with the callsign W4DLZ, oldest first.
- THRASH, FRANK W FL2006-05-31 → cancelled 2014-01-07
- THRASH, FRANK W FL2014-06-03 → cancelled 2026-06-04